Transmission lock for motor vehicles



Maych 24, 1925.

1,530,801 I. L. AKIN TRANSMISSION LOCK FOR MOTOR VEHICLES Filed Oct. 17,1923 i Z5 1 zv z? Z6 1 one Q A ul/Enron -\\.-N .\m Br ATTORNEYs-Patented Mar. 24, 1925.

omrso 'IEVIN' LANCJXSTERF AKIN, OF OKLAHOMA. "GITYfO'KL-AHOMAQ.

TRANSMISSION/DOCK FOR MOTOR vra rronns.

-Applai cation filed flctoberl7y l fi23. uSriaMNo. seams.

To all "(.LIILOIIL z'twm concern Be it known that I, IRVINb LANoAs'rn-aIra-i a citizen of the United States, and a resident of Oklahoma City,in the-county; of Oklahoma and State; of Ohl ahoma, have invented a newand. usefiul Improvement 21in 'irransmESi-on Looks for. Motor Vehicles,of which the folhming is a full, clear, 1311(1 exact description.

My invention relates to improvements in transmission loclrstor motorvehi l es, and it consistsiin the combinations; co" actions, andar-rangemei-its herein (described; and claimed.

An object of my invention is to provide a .ransmission lock of thecharacter, described by means of whichthe vehicle.inayunotbe driven nortowed away. l Vith the-ordinary type of steering wheel lock or ignitionlock, it is possible to tow: the. motor vehicle away bylittinglthe EEOTQ W reels from the roadand towing: the vehicle. withonly i the rear wheels on theground. This could not hezQarr-ied out witha motor vehicle eqnippeclmrith my improved transmission lock.

start-her object of my inventionis to proride a FtlililSllliSSiOIl lockof .the character described in which all possibility of; the lock makingengagement with ft-llfl 1 transmission tion is precluded. Thisis=animportantim-- y proveme-nh'since if the lock shouldbecome engagedwhile the vehicle is in motion, great damage would be i brought about inthe transmission gears as Well as the differential shaft.

A further object of my. invention is to provide transmi ssionlock of thecharacter described in which the. looking member may. be brought intoeffective engagement, with the principal wheel lot:thetransmission. hymerelyelevating the draw lever disposed: adjacent the speed controllover of the motor vehicle. r

it turther object of my invention provide adevice ofthetype"'descrilgredin.

which any shiftingofthegearswhen the: V

.; of thew e'earonthe shaft 2. This elementpi l or "it-he purpose.of1preventing .inanual;a

locis in operative position is precluded.

A further objector my invention. is to proride a transmission lock atthe character described which may be easily applied. to the ordinarytype oi? transmission without necessitating the reconstruction of any ofthe parts thereof.

A further object of my invention isto provide a trmismission lock of thecharacter described which i is si nple 1 in construction,

durable, and thoroughly ellioient 'tor' the se intended.

e'cts and'adnant woes v-sill. appear disposed v and arranged :tor manualiopera- 7 tion for the controlling-of powen transi-nittedrirom :theengine shaft to: a" dirtt'erent-ial shaft 2 of a-inotor vehicle. low andJ's-verse speed gears feathered upon. the adiilerenti l-.;shatt: 2:sowthat:the gear 3 must 'iturn therewith. I 'TlllSwgGZlI" 3 is .the

only gear employed as a cooperating part of my lhhlip rovedtransmissionlo ck.

1A'steelsti ap' or hanger tissecurely fixed onxthe im e'rairall 5 ofthe-transmission :cas ing 1 Joy means of ScreWs 6;: which screws aredisposed With .theirpheads on the inner side'of the oasingsothatitheynn'iay not. be removed hy external: manipulation.

. A11:arcuate:lockinguinember 7 ishinge-oily mounted aupon thelianger tat 8. The curve in. .thearcuate .member 7 is substantially concentricWith the peripheral edge of the gear; 3 ,as shown' in Figure v1. Thislocking member is: provided, with, a plurality of gear teeth. 9 on 16inner Wallthereotae ranged to accurately register Witlrthe spacesbetween the. gear teeth 10 and the \gear A.-U-shap,ed member 11 is linedby means of arivejts: 12s)? as to st ddlethe locking member.7Mfdl1Cl-iOJPQFHUt the parallel portionsthereof toiengage-with the sidewalls of the" gear 8-,! thereby precluding movement is. shittii'ig ofthe gearEB-Wvhen :thelock is in effective operation so that the gear maynot be moved out of registration with the teeth 9 and thereby permittowing of the vehicle or moving of the vehicle underits own power in ahigher speed.

The steel link 13is pivotally mounted at air embodi- ,igspecification;and the-novel to at a member 16 provided with external threads 17 at theouter end thereof.

A vertically extending tubular casing 18, secured to the transmissioncasing" 1 by means of bolts 19, is provided for the purpose of partiallyhousing a draw rod 20 by means of which the locking member 7 may bemanually drawn into engagement with the gear 32. a

A compression spring 21 mounted concentric with the draw rod 20 anddisposed within the casing 18, is provided for'the purpose of normallymaintaining the draw rod 20 in a lowered position so that the lockingmember 7 is out of engagement with the gear 3. In order to causeengagement of the .locking member 7 with the gear 3, it is necessary tooppose the force of the sprin 21. The pin 22 is projected through the craw rod 20 and serves a dual purpose, first, to

retain the lower end of the spring against movement relative to the drawrod, and second, to prevent the rotation of the draw rod 20 when in anelevated position, (see Figure 1). This is brought about by theprovision of recesses 23, diametrically opposed, at the lower end of thetubular casing 18 in which the pin 22 may set when the rod is elevated.

The draw rod 20 is provided with a hand grip 25 at the upper end thereofby means of which manual movement of the rod is facilitated. The tubularcasing 18 has an integral compartment 26 formed on one side wall thereofin which a locking mechanism comprising a latch 27 and a cam 28 operatedby akey projected through the key slot 29 is disposed. Movement of thecam 28 by means of a suitable key provided to extend to the slide 29causes the draw bolt 27 to move against the action of a spring 30 andthereby out of engagementwith the recess 31 provided in the sidewallsof'the drawl rod 20.

From the foregoing description of the va rious parts of the device, theoperation thercof may be readily understood. In applying my improvedtransmission lock to the ordinary type of transmission, it is merelynecessary to remove the transmission cover to fix the casing 18 in placeas shown in Figure 1 and to secure the hanger 41- by means of themachine screws 6 to the inner wall of the 23 of the member 16 by meansof the interiorly threaded socket 32 at" the lower end thereof, and thelock is assembled and ready for use.

When it is desired to lock the motor vehicle so that it may not be movednor driven drive the car by shifting the gears will be entirelyprecluded since the gear 3 willbe stopped from lateral movementon theshaft 2 by means of the U-shaped member 11. In order to unlockthevehicle so that it may be driven, it is merely necessary to insert akey properly provided, through the slot 29, to turn the key, causingmovement of the cam 28, and the drawing of the bolt 27 out of engagementwith the draw bolt 20. The force of the spring 21 will occasion adownward movement of the locking member 7 and thus disengage the lockingmember 7 and the gear 3.

I claim:

1. The combination with a motor vehicle transmission, having a driveshaft and a gear arranged to turn with said drive shaft, of a lockingmember having the contour of a segmental gear, said locking member beingdisposed beneath said. gear, normally free of the teeth thereof, aplunger connected with said locking member, whereby said locking membermay be drawn upwardly into engagement with the, teeth of said gear, anda spring for yieldin'gly maintain ng said plunger in a retractedposition.

2. The combination with a motor vehicle transmission, having a driveshaft and a gear arranged to turn with said drive shaft, of a lockingmember having the contour of a segmental gear, said locking memberbeing' disposed beneath said gear, normally free of the teeth thereof, aplunger connected with said locking member, whereby said locking membermay be drawn upwardly into engagement with the teeth of said gear, aspring for yieldingly maintaining said plunger in a retracted position,and a key actuated lock for locking said plruiger in an elevatedposition against the action of said spring, whereby said; locking membermay be held in engagement with the teeth ot said gear.

IRVIN LANCASTER AKIN.

